If you are flushing your black and grey water tanks or cleaning out a tote tank, then you have to use a separate hose so that you don’t risk cross contamination with a drinking water hose. The Camco RhinoFLEX 25’ Grey Water Hose is made of durable PVC and is bright orange so that you don’t mix it up with your drinking water hoses by accident. The ends are compatible with standard garden hose threads.